Machine for truing pulleys.



No. 627,862. Patented June 27, I899.

W. A. MARSHALL.

MACHINE FOR TRUING PULLEYS.

(Application filed Apr. 8, 1897.)

2 Sheets-Sheet I.

(No Model.)

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no. 627,362. Patented June 27, I899.

w. A. MARSHALL.

MACHINE FDR TRUING PULLEYS.

(Application filed Apr. 6, 1 897.) (No Model.) 2 Sheets-Sheet 2.

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J'NITED, STATES \VILLIAM A. MARSHALL, OF LUDINGTON, MICHIGAN.

MACHINE FOR TRUING PULLEYS.

SPECIFICATION forming part of Letters Patent No. 627,862, dated June 27, 1899.

hpplication filed April 6, 1897.

To all whont it may concern:

Be it known that 1-,W1LLIAM A. MARSHALL,

a citizen of the United States, residing at Lud ington, in the county of Mason and State of Michigan, have invented certain new and useful Improvements in Machines for Truing Pulleys; andIdo hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

The object of this invention is to provide a machine for truing the peripheries or outer faces of large pulleys or wheels, and is especially adapted for truing the faces of bandsaw wheels, being made in different sizes to suit the character of work or size of the wheels to be operated upon.

The invention contemplates a construction in which the device takes its driving power from the wheel which is being operated upon without removing said wheel from its shaft, and the arrangement of theparts is such that l the emery or grinding wheel is susceptible of minute adjustment to bring it in proper contact with its work to act upon theentire surface of the periphery of the wheel.

Having the above objects in view, the invention consists in an apparatus or machine for truing or grinding the face of a pulley or wheel, comprising a supporting-frame carrying a shaft upon which the grinding-wheel is mounted, and a second shaft having a pulley or Wheel in engagement with the wheel to be trned and geared to the shaft of the emerywheel.

The invention further consists in a machine for truing or grinding the face of a pulley or wheel, comprising a supportingframe having a shaft journaled thereon and carrying the emery-wheel, a second shaft having a pulley or wheel in engagement with the wheel which is being operated upon, and devices for adjusting the emery-wheel.

In the following specification I have entered into a detailed description of the parts which constitute the invention, reference being had to the accompanying drawings and to letters and numerals thereon, which designate the different parts, and what I consider to be the novel features of construction are specifically recited in theclaims.

.of the shaft and grinding-wheel.

Serial No. 630,929. (no model-l tical sectional view through the longitudinal center of the machine on the line 4 4 of Fig. 3.

With reference to said drawings, 1 designates a bed-plate upon which the machine is placed and firmly held, the said bed-plate for this purpose being provided with upwardly projecting side flanges, through which pass clamping-screws 2, that engage the machine and, being adjustable, permit said machine to be shifted or turned at an angle with respect to the bed-plate, for the purpose .hereinafter set forth. Clamped in the bed-plate is a rectangular frame 3, which forms the supporting-frame of the machine and is constructed to present guides for the movable parts thereof. To this end the supporting-frame is made up of side pieces 4, connected to each other at one end by a cross-piece 5, and upon this end of the frame and extending across the same are parallel guide-rails 6, having grooves a, while the inner edges of the side pieces are provided with grooves 19. Having a sliding movement between the guide-rails 6 isa bearing-box 7, forming a support for one end of the main shaft 8, upon which the grinding- Wheel 9 is mounted, said box having lateral flanges c fitting the grooves a. The main shafthas a longitudinal sliding movement in this bearing-box to provide for an adjustment The other end of the shaft is supported in a bearingbox 10, which latter has a sliding movement correspondingwith that of the bearing-box 7 and is or tonguesffitting the grooves Z) in said side pieces. The shaft moves longitudinally with the box 10, the grinding-wheel 9 bearing against one side of said box, while the rigid collar 35 bears against the other side, and when moved or adjusted longitudinally the shaft slides in the other box, which has only a. lateral movement on the supporting-frame.

The shaft 8 is driven from a shaft 15, journaled in the upper ends of inclined supports 16, hinged to one of the side pieces of the supporting-frame 3, and the said shaft has a friction-wheel 17 fixed on one end and adapted to be brought into engagement with the periphery of the wheel which is being trued to receive power therefrom. A driving-belt 14 passes from a pulley 18 on shaft 15 over a pulley 13, loosely mounted on the main shaft, said driving-belt being crossed between the pulleys in order that the grinding or emery wheel which is mounted upon the main shaft will be rotated in an opposite direction from the rotation of the pulley or wheel upon which it acts. The wheel 17, which is the drivingwheel of the grinding-machine, is brought into engagement with the wheel or pulley upon which the device is operating by swinging the inclined supports 16 and holding them in an adjusted position by means of the brace 19, it being understood that the wheel being operated upon is fast upon a driven shaft. In other words, the pulleyor wheel to be ground is not removed from its shaft, so that the power to drive the grinding or trning machine is taken from said driven shaft.

In order to provide for adjusting the grind ing-Wheel so as to bring it into proper contact with the wheel or pulley which it is desired to true, the movable boxes for the shafts upon which said grinding-wheel is mounted are connected to certain devices for moving them with respect to the supporting-frame 3. For this purpose a horizontal shaft 20 is provided, having a crank-handle 21 at one end and provided with bevel- Wheels 22 and 23. This shaft is supported at one end in a bracket 2%, secured to one of the side pieces 4: of the supporting-frame, and the other end of said shaft is supported loosely in a bracket 25, carried by the sliding frame 12, which permits said frame to move independent of the shaft, the bevel-wheel 23 being loosely mounted upon the said shaft and rotates therewith by means of the ordinary spline and feather. A shaft 26 v is geared to the bevel-wheel 22 by means of a corresponding wheel 27 in meshtherewith, and the said shaft 26 has a threaded inner end which engages a lug 28 on the bearingbox 7, provided with a threaded aperture for the purpose. A lug 29 is mounted upon the other bearing-box 10 and is engaged by a shaft 30, which bears in the-bracket of the sliding frame 12 and has a bevel-wheel 31 in mesh with the bevel-wheel 23,"movable on the shaft 20. By this arrangement of shafts and intermeshing gear-wheels in connection with the threaded rods 26 and the grindingwheel can be moved laterally of the machine to and from the periphery of the wheel to be operated upon by turning the shaft- 20. Now

in order to provide for a longitudinal movement of the grinding-wheel means are provided for moving the sliding frame 12, which carries one of the bearings for the shaft 8, upon which the said grinding-Wheel is mounted, and to this end an operating shaft or screw 32 is passed through the bearing-box 7 and has a threaded end which engages a threaded sleeve or socket 33, carried by the bearingbox 10.

It will be seen that by turning the crankhandle 34 at the end of the screw 32 the frame 12, which carries the bearing-box 10, will be moved within the supporting-frame 3, and the main shaft being held upon this bearing-box by means of the grinding-wheel and rigid collar 35 will move therewith and carry the grinding-wheel across the periphery of the wheel to be trued or ground. To provide for connecting the pulley 13 to the shaft 8, so that the latter can inove freely through said pulley, the ordinary spline and feather are also employed at this point.

As hereinbefore stated, the frame 3, which forms the supporting-frame of the machine, is held within the bed-plate 1 by means of the set-screws 2 2, engaging thesides of said frame 3, and by properly adjusting these screws the angle of said frame can be changed with respect to the bed-plate, and consequently the grinding-wheel adjusted with respect to the periphery of the wheel or pulley whichis being operated upon. The bed-plate is also provided with outwardly-projecting lugs 35 on opposite sides,to which the inclined su pports 16 are fastened, this particular arrangement of the bed-plate providing for changing the supports to provide a right or left hand machine or adapt the machine to accommodate the pulley or wheel which is to be trued or ground.

From the foregoing description, in connection with the accompanying drawings, the construction and operation of my improved machine for grinding or truing the faces of large pulleys or wheels will be readily apparent, for the frame is supported adjoining the wheel or pulley to be trued, and said wheel or pulley having a rotation withits shaft the wheel 17 of the machine is brought into contact therewith and, receiving rotation by frictional contact, will rotate the shaft 15, and through the intervention of the belt 14, that is crossed, as shown, the shaft 8 will be rotated in an opposite direction from the rotation of the wheel or pulley to be ground or trued, so that the grinding-wheel fixed on said shaft will better act upon the face of said wheel or pulley. \Vhen it is desired to adjust the grinding-wheel toward the periphery of the wheel or pulley, it can be done by turnin g the crank-handle 21, which will turn the threaded rods 26 and 30 through the intervention of the shaft 20 and bevel-wheels and slide the supports or bearings for the shaft of the emery-wheel to move the latter to the desired extent. A further adjustment can be had to move. the emery-wheel across the periphery ofthe wheel or pulley by turning the screw 34, which moves the sliding frame 12 and the bearing-box, which is connected directly to the shaft of the said grindingwheel. Thus it will be seen that I provide a machine which takes its power from the pulley or wheel which is being trued or polished, and the emery or grinding wheel is supported in such manner as to make the same capable of various adjustments to bring it in proper contact with the surface to be operated upon.

Having thus-described my invention, what I claim as new, and desire to secure by Letters Patent, is j 1. In a machine for the purpose set forth, the combination with a bed-plate, of a frame adjustable therein and carrying bearings which are movable with respect. to the frame, a shaft journaled in the bearings and having an emery-wheel mounted thereon, means for adjusting the emery-wheel by moving the bearings of the shaft together with the second shaft suitably supported and geared to the first-named shaft, and a roller or wheel on the second shaft adapted to be brought in contact with the pulley or wheel which is operatedupon, substantially as shown and described.

2. In a machine of the character described, the combination with a frame having transverse guide-rails, bearings or shaft-supports in sliding engagement with said rails, the shaft supported in said bearings carrying an emery-wheel, means for moving the bearings or shaft-supports, and driving mechanism for the shaft, substantially as shown and described.

3. In a machine of the character described, the combination with the supporting-frame presenting transverse guide-rails, bearings or shaft-supports in sliding engagement with said rails, threaded rods engaging the bearings and in mesh with a shaft common to both, the movable sh aft-supports carrying the shaft having an emery grinding-wheel mounted thereon, and means for turning the said shaft, substantially as shown and for the purpose set forth.

4. In a machine of the character described, the combination with the supporting-frame presenting transverse guide-rails at one end, a frame mounted within said supportingframe and in sliding engagement therewith, guide-rails carried by the sliding frame, bearings or shaft-supports in sliding engagement with the guide-rails, threaded rods engaging the bearings or shaft-supports, and means for turning said threaded rods in unison; to-

' gether with the shaft carried by the movable bearings and having an emery-wheel, a second shaft suitably supported and geared to the shaft of the emery-wheel, and a roller or wheel on the second shaft adapted to be brought into engagement with the periphery of the wheel which is operated upon, substantially as shown and for the purpose set forth.

5. In a machine of the character described, the combination, of the supporting-framehav ing longitudinal and transverse guide-rails, a frame movable within thelongitudinal guiderails and provided with transverse guide-rails,

bearings or shaft-supports at each end of the frame in slidingengagement with the transverse guide -rails, a shaft mounted in the shaft-supports, said shaft being movable with the shaft-supports carried by the movable frame and slidable in the other shaft-supports, and a screw adapted to adjust the movable frame; together with a second shaft supported in suitable bearings,a pulley mounted thereon and connected by belt to a pulley on the main shaft, a friction-wheel on the second shaft adapted to be brought into engagement with the wheel being operated upon, and a grinding-wheel on the main shaft, substantially as shown and for the purpose set forth.

6. In a machine of the character described, the com bination,of the supporting-frame having longitudinal and transverse guide-rails, a frame movable within the longitudinal guiderails and provided with transverse guide-rails, bearings or shaft-s11 pports at each end of the supporting-frame in sliding'engagement with the transverse guide-rails, a shaft mounted in the shaft-supports and carrying apulley and grinding-wheel,said shaft being movable with the movable frame and shaft-supports carried thereby and slidable in the other shaft-sup ports, and a screw adapted to adjust the movable frame; together with extensible bars hinged to the supporting-frame, a brace-rod connected to one of said bars, a second shaft mounted in the extensible bars, a pulley on said second shaft connected by a crossed belt with the pulley on the main shaft, and a fric tion-wheel on the second shaft adapted to be brought into engagement with the wheel be ing operated upon, substantially as shown and for the purpose set forth.

In testimony whereof I have signed this specification in the presence of two subscribing witnesses.

WM. A. MARSHALL.

Witnesses:

THOS. P. MOMASTER, O. M. HOPKINS. 

